Abstract: The problems of disproportion, internal dump tension early and sudden release in final phase, exists during transition in open-pit mining by areas, which causes the underutilization of inner dump and increased covering area for external dumping and difficulties of final rehabilitation. In order to solve the problems of internal dumping disproportion under dragline stripping technology during transition in Heidaigou open-pit mine, using unified dumping ratio and stripping ratio as well as the method of heightening internal dumping is put forward under the conditions of external dumping or not. Last, the study of Heidaigou open-pit mine shows that the method can well solve the problem of disproportion.